Lift-bridge.



J. A. L. WADDELL & J. L. HARRINGTON. I

LIFT BRIDGE.

' APPLICATION FILED AUG. a1, 1908.-

Patented Aug". 24, 1909.

J. A. LwA-DDELL & J. L. HARRINGTON.

LIFT BRIDGE.

APPLICATION FILED AUG. 31, 1908. 932,359 7 Patented Aug. 24, 1909.

2 SHEETSSHEET 2.

P BY Ja/r Ayeflamnfan. I; i m 3M m:

- A'TTORNE y.

' and John LYLE HARRINGTON, both citizens provided with a suitable flooring 5 which is I bridge towers 3.

,corner thereof, are revolubly mounted the.

trainee snares ATENT were.

JOHN A. L. WADDELL AND JOHN LYLE HiiRJBZFiGYZ'ON, @ii' M333 CITY, MKSSGURX.

LIFT-BRIDGE.

T 0 (LZZ whom it may concern:

Be it known that we, JOHN AJL. WADDELL of the United States, residing at Kansas City, 5 in the county of Jacksonand Stateof Missouri, have invented certain new and useful Improvements Lift-Bridges; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to maiwand use the same, refcrcnce being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

Our inventionrelates to lift bridges, and has for its object to provide a bridge of that class wherein the motive power for raising and lowering a movable s an may be supported by and travel with. t e span structure.- In accomplishing this object we provide the improved details of structure presently described and ointed out in the claims form ing part of t is specification, reference being Specification 012 Letters Patent. Application filed August 31,

-erativeiy connected with the had to the accompanying drawings, in which Figure I is an elevation of a lift bridge constructed according to our invention. Fig. II is a plan view of same. Fig. III is an end view oi same. Fig. IV is a sectional view of one of the elevator cable drums, on the line IV-IV, Fig. V. Fig. V is a side view of one of the drums. Fig. V1 is an elevation of same.

Referring more in detail to the parts :1 designates piers which may be arranged at opposite sides of or in the channel of a stream 2 and support, or assist in supporting, the

4 designates a bridge span which is adaptfor vertical travel between the towers 3 and for support on the piers 1, the span being adapted for cooperation with the flooring of the approachesfi to form a continuous roadway across the stream when the span isin its lowered position. I

On the towers 1, preferably at each inner sheaves 7, overeachoi which arope8 is 12 unwinding from the 'ducing movement adapted to travel,.the ends of each rope Patented Aug.

at, 11.96%). ices. Serial No. teases.

' being respectively attached to the s n and to a couuterpoise weight '9. evolubly mounted in suitabie hearings on the s an e are the shafts 10, upon which are rigidly mounted the drums 11', which are preferably provided with rone'grooves as shown. Fixed to the upper on of each of the towers 1 are the ropes 12 the lower ends of which are wound on and attached to, adjacent drums 11, and fined to the lower ends or the towers 1 are the ropes 12' ,are also wound on and attached to drums 1 l.

13 desi nates a motor that is sup orted beneath the iloo oi the span 4 an is op: drum shaits 10, preferably b means of a transmission shaft 14. and beve ed gearing 15 and 16.

When the structure is in use as an ordinary traific bridge;- the s an 4 rests on the piers 1 and cooperates wit the a preaches, as previously described and i ustrated. in the drawin s. Should it be desired to clear the charms for the passage of a' vessel, the motor is operated .to' reduce a revolution of the shafts 10 and d rums M. As the drums revolve the ropes 12 are wound thereon to produce an upward travel of the span, the ropes same drums as the span travels u wardly. As soon as the span has reached t e desired height its travel is stopped by shutting off the motor and it remains stationary during the passage of the vessel therebeneath. To lower the span, the motor is operatedin the opposite direction so that the ropes 12 are wound on the drums l1 and the ropes i2 oi the span downwardly to its'original position.

It is readily apparent that auxiliary parts such as buffers and'locking members may be used in connection with our improved bridge, but as such parts form no part of our invention the have been neither described nor illustrated:

Having thus described our invention, what we claim as new therein and desire to secure by Letters-Patent is I in a lift bridge, the combination with stationary towers, of a counterpoised span adapted for vertical travel between said towers, paired drums revolubly mounted at the upper ends of which unwound therefrom, propresent ropes positively fixed to eac each end of said span, indep1 ndent pairs of In testimony whereof weeflix our signs,-

of sand drums, tures 1n presence of two witnesses.

one of the ropes of each pair beingattached JOHN A. L. WADDELL.

to the upper portion of one of the towers, and JOHN LYLE HARRINGTON. the other rope to a lower portion of the same Witnesses:

tower, and means carried by the span for A. 0. BROWN,-

actuating said drum. MYRTLE M. JACKSON. 

